DocumentCode :
1224581
Title :
Design and Construction of an Ultrasonic Pneumotachometer
Author :
Plaut, David I. ; Webster, John G.
Author_Institution :
Analytical Division, Nicolet Instrument Corporation
Issue :
10
fYear :
1980
Firstpage :
590
Lastpage :
597
Abstract :
Pneumotachometers (PTM´s) measure the instantaneous rate of volume flow of respired gas. Currently existing PTM´s suffer from a number of limitations. Ultrasonic PTM´s are superior in a number of ways to these PTM´s, but have not yet achieved acceptance due to instabilities and inaccuracy. We investigated a new design which used cylindrical shell transducers to generate ultrasound and measured phase shift as a measure of transit time change due to flow. The results were linear and predictable over a wide dynamic range using a single gas under controlled conditions, but deviated from expected values when the gas composition changed. We evaluate our original model of UPTM operation and revise it in light of our findings.
Keywords :
Fluid flow measurement; Immune system; Instruments; Phase measurement; Time measurement; Ultrasonic imaging; Ultrasonic transducers; Ultrasonic variables measurement; Velocity measurement; Volume measurement; Forced Expiratory Volume; Humans; Rheology; Ultrasonics;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.1980.326581
Filename :
4123141
Link To Document :
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